Iam passing Hashtable to JNI and tried to access the get method of Hashtable in C by passing a key. Iam not gettting the value. instead it throws a dump and server exits.

the exception happens in the CallObjectMethod. iam getting a valid methodid though.

Java Code

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Hashtable ht = new Hashtable();

ht.put("1", "one");

ht.put("2", "two");

public native String getHashValue(Hashtable ht);

C Code

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JNIEXPORT jstring JNICALL JNI_getHashValue(JNIEnv *env, jobject thisobj, jobject hashtable)

{

jclass hashClass=(*env)->GetObjectClass(env,hashtable);

jmethodID getMethod = (*env)->GetMethodID

(env,hashClass,"get","(Ljava/lang/Object;)Ljava/lang/Object;");

jobject jkey = "1";

jobject jstr = (jobject)(*env)->CallObjectMethod(env,hashtable, getMethod,jkey);

printf("the string is %s
", jstr);

}